/*
 * Copyright (c) 2000, Boris Popov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: file.c,v 1.4 2004/12/13 00:25:21 lindak Exp $
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
 */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <libintl.h>

#include <sys/types.h>
#include <sys/file.h>

#include <netsmb/smb.h>
#include <netsmb/smb_lib.h>

#include "private.h"

/*
 * It's not actually necessary to call the CLOSEFH ioctl, but doing it
 * makes debugging a little easier.  If we were to skip the ioctl,
 * nsmb_close would cleanup the handle, here or in process exit.
 */
int
smb_fh_close(int fd)
{
        (void) nsmb_ioctl(fd, SMBIOC_CLOSEFH, NULL);
        return (nsmb_close(fd));
}

int
smb_fh_ntcreate(
        struct smb_ctx *ctx, char *path,
        int req_acc, int efattr, int share_acc,
        int open_disp, int create_opts)
{
        smbioc_ntcreate_t ioc;
        int err, nmlen;
        int new_fd = -1;
        int32_t from_fd;

        nmlen = strlen(path);
        if (nmlen >= SMBIOC_MAX_NAME) {
                err = EINVAL;
                goto errout;
        }

        /*
         * Will represent this SMB-level open as a new
         * open device handle.  Get one, then duplicate
         * the driver session and tree bindings.
         */
        new_fd = smb_open_driver();
        if (new_fd < 0) {
                err = errno;
                goto errout;
        }
        from_fd = ctx->ct_dev_fd;
        if (nsmb_ioctl(new_fd, SMBIOC_DUP_DEV, &from_fd) == -1) {
                err = errno;
                goto errout;
        }

        /*
         * Do the SMB-level open with the new dev handle.
         */
        bzero(&ioc, sizeof (ioc));
        strlcpy(ioc.ioc_name, path, SMBIOC_MAX_NAME);
        ioc.ioc_req_acc = req_acc;
        ioc.ioc_efattr = efattr;
        ioc.ioc_share_acc = share_acc;
        ioc.ioc_open_disp = open_disp;
        ioc.ioc_creat_opts = create_opts;
        if (nsmb_ioctl(new_fd, SMBIOC_NTCREATE, &ioc) == -1) {
                err = errno;
                goto errout;
        }

        return (new_fd);

errout:
        if (new_fd != -1)
                nsmb_close(new_fd);
        errno = err;
        return (-1);
}

/*
 * Conveinence wrapper for smb_fh_ntcreate
 * Converts Unix-style open call to NTCreate.
 */
int
smb_fh_open(struct smb_ctx *ctx, const char *path, int oflag)
{
        int mode, open_disp, req_acc, share_acc;
        char *p, *ntpath = NULL;
        int fd = -1;

        /*
         * Convert Unix path to NT (backslashes)
         */
        ntpath = strdup(path);
        if (ntpath == NULL)
                return (-1);    /* errno was set */
        for (p = ntpath; *p; p++)
                if (*p == '/')
                        *p = '\\';

        /*
         * Map O_RDONLY, O_WRONLY, O_RDWR
         * to FREAD, FWRITE
         */
        mode = (oflag & 3) + 1;

        /*
         * Compute requested access, share access.
         */
        req_acc = (
            STD_RIGHT_READ_CONTROL_ACCESS |
            STD_RIGHT_SYNCHRONIZE_ACCESS);
        share_acc = NTCREATEX_SHARE_ACCESS_NONE;
        if (mode & FREAD) {
                req_acc |= (
                    SA_RIGHT_FILE_READ_DATA |
                    SA_RIGHT_FILE_READ_EA |
                    SA_RIGHT_FILE_READ_ATTRIBUTES);
                share_acc |= NTCREATEX_SHARE_ACCESS_READ;
        }
        if (mode & FWRITE) {
                req_acc |= (
                    SA_RIGHT_FILE_WRITE_DATA |
                    SA_RIGHT_FILE_APPEND_DATA |
                    SA_RIGHT_FILE_WRITE_EA |
                    SA_RIGHT_FILE_WRITE_ATTRIBUTES);
                share_acc |= NTCREATEX_SHARE_ACCESS_WRITE;
        }

        /*
         * Compute open disposition
         */
        if (oflag & FCREAT) {
                /* Creat if necessary. */
                if (oflag & FEXCL) {
                        /* exclusive */
                        open_disp = NTCREATEX_DISP_CREATE;
                } else if (oflag & FTRUNC)
                        open_disp = NTCREATEX_DISP_OVERWRITE_IF;
                else
                        open_disp = NTCREATEX_DISP_OPEN_IF;
        } else {
                /* Not creating. */
                if (oflag & FTRUNC)
                        open_disp = NTCREATEX_DISP_OVERWRITE;
                else
                        open_disp = NTCREATEX_DISP_OPEN;
        }

        fd = smb_fh_ntcreate(ctx, ntpath,
            req_acc, SMB_EFA_NORMAL, share_acc, open_disp,
            NTCREATEX_OPTIONS_NON_DIRECTORY_FILE);

        free(ntpath);
        return (fd);
}

int
smb_fh_read(int fd, off64_t offset, size_t count,
        char *dst)
{
        struct smbioc_rw rwrq;

        bzero(&rwrq, sizeof (rwrq));
        rwrq.ioc_base = dst;
        rwrq.ioc_cnt = count;
        rwrq.ioc_offset = offset;
        if (nsmb_ioctl(fd, SMBIOC_READ, &rwrq) == -1) {
                return (-1);
        }
        return (rwrq.ioc_cnt);
}

int
smb_fh_write(int fd, off64_t offset, size_t count,
        const char *src)
{
        struct smbioc_rw rwrq;

        bzero(&rwrq, sizeof (rwrq));
        rwrq.ioc_base = (char *)src;
        rwrq.ioc_cnt = count;
        rwrq.ioc_offset = offset;
        if (nsmb_ioctl(fd, SMBIOC_WRITE, &rwrq) == -1) {
                return (-1);
        }
        return (rwrq.ioc_cnt);
}

/*
 * Do a TRANSACT_NAMED_PIPE, which is basically just a
 * pipe write and pipe read, all in one round trip.
 *
 * tdlen, tdata describe the data to send.
 * rdlen, rdata on input describe the receive buffer,
 * and on output *rdlen is the received length.
 */
int
smb_fh_xactnp(int fd,
        int tdlen, const char *tdata,   /* transmit */
        int *rdlen, char *rdata,        /* receive */
        int *more)
{
        smbioc_xnp_t    ioc;

        /* this gets copyin & copyout */
        bzero(&ioc, sizeof (ioc));
        ioc.ioc_tdlen = tdlen;
        ioc.ioc_rdlen = *rdlen;
        ioc.ioc_more = 0;
        ioc.ioc_tdata = (char *)tdata;
        ioc.ioc_rdata = rdata;

        if (nsmb_ioctl(fd, SMBIOC_XACTNP, &ioc) == -1) {
                *rdlen = 0;
                return (-1);
        }

        *rdlen = ioc.ioc_rdlen;
        *more  = ioc.ioc_more;

        return (0);
}